<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <style>
      .container {
        width: 600px;
        height: 300px;
        padding: 20px;
        margin: 0 auto;
        border: 2px solid #ccc;
      }
      .item {
        background: #f19752;
        border: 2px solid #ee772f;
        text-align: center;
        line-height: 100px;
        font-size: 2em;
      }
    </style>
    <style>
      /* 在这里完成作业 */
    </style>
  </head>
  <body>
    <div class="container">
      <div class="item item1"></div>
      <div class="item item2"></div>
      <div class="item item3"></div>
      <div class="item item4"></div>
      <div class="item item5"></div>
      <div class="item item5"></div>
      <div class="item item5"></div>
      <div class="item item5"></div>
      <div class="item item5"></div>
    </div>
  </body>
</html>

